<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div>
    <input type="text" id="nickname" value="昵称"/>
    <button onclick="connectWebSocket()">进入聊天室</button>
    <button onclick="closeWebSocket()">断开连接</button>
    <hr/>
    <br/>
    消息：<input id="text" type="text"/>
    频道号：<input id="toUser" type="text"/>
    <button onclick="send()">发送消息</button>
    <div id="message"></div>
</div>
<script type="text/javascript">
    var websocket = null;

    function connectWebSocket() {
        var nickname = document.getElementById("nickname").value;
        if (nickname === "") {
            alert("请输入昵称");
            return;
        }
        //判断当前浏览器是否支持WebSocket
        if ('WebSocket' in window) {
            websocket = new WebSocket("ws://jupiterso.com/websocket/" + nickname);
        } else {
            alert('Not support websocket')
        }
        //连接发生错误的回调方法
        websocket.onerror = function () {
            setMessageInnerHTML("error");
        };
        //连接成功建立的回调方法
        websocket.onopen = function (event) {
            setMessageInnerHTML("Loc MSG: 成功建立连接");
        }
        //接收到消息的回调方法
        websocket.onmessage = function (event) {
            setMessageInnerHTML(event.data);
        }
        //连接关闭的回调方法
        websocket.onclose = function () {
            setMessageInnerHTML("Loc MSG:关闭连接");
        }
        //监听窗口关闭事件，当窗口关闭时，主动去关闭websocket连接，防止连接还没断开就关闭窗口，server端会抛异常。
        window.onbeforeunload = function () {
            websocket.close();
        }
    }

    //将消息显示在网页上
    function setMessageInnerHTML(innerHTML) {
        document.getElementById('message').innerHTML += innerHTML + '<br/>';
    }

    //关闭连接
    function closeWebSocket() {
        websocket.close();
    }

    //发送消息
    function send() {
        //获取输入的文本信息进行发送
        var message = document.getElementById('text').value;
        var toUser = document.getElementById('toUser').value;
        var socketMsg = {msg: message, toUser: toUser};
        if (toUser == '') {
            //群聊.
            socketMsg.type = 0;
        } else {
            //单聊.
            socketMsg.type = 1;
        }
        websocket.send(JSON.stringify(socketMsg));
    }
</script>
</body>
</html>